<template>
  <div class="login_container">
    <div class="login_box">
      <!--   头像区域   -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="vue-logo">
      </div>
      <!--   登录表单区域  -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="" class="login_form">
        <!-- 用户名 -->
        <el-form-item label="" prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item label="" prop="password">
          <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password"></el-input>
        </el-form-item>
        <!-- 登录按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data: function () {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      loginFormRules: {
        // 验证用户名合法
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        // 验证密码合法
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击重置按钮，重置登录表单
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        // console.log(valid)
        if (!valid) return
        // 将结果里的data解构成result
        const { data: result } = await this.$http.post('login', this.loginForm)
        // console.log(result)
        if (result.meta.status !== 200) return this.$message.error('登录失败')
        // console.log('failed login!')
        // console.log('success login!')
        this.$message.success('success login!')
        // 1. 将登陆成功之后的 token ， 保存到客户端的 window.sessionStorage 中
        //   1.1 项目中除了登录之外的其他API接口，必须在登录之后才能访问
        //   1.2 token 只应当在当前网站打开期间生效， 所以将 token 保存在 sessionStorage
        window.sessionStorage.setItem('token', result.data.token)
        // 2. 通过编程式导航跳转到后台主页，路由地址是 /home
        await this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
  .login_container{
    position: relative;
    background-color: #2b4b6b;
    height: 100%;
  }
  .login_box{
    position: absolute;
    display: block;
    left: 50%;
    top: 50%;
    width: 450px;
    height: 300px;
    background-color: aliceblue;
    border-radius: 3px;

    .avatar_box{
      position: absolute;
      left: 50%;
      padding: 10px;
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      box-shadow: 0 0 10px #dddddd;
      background-color: #ffffff;
      img{
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eeeeee;
      }
    }
  }

  .login_box{
    transform: translate(-50%) translateY(-50%);
  }

  .avatar_box{
    transform: translateX(-50%) translateY(-50%);
  }

  .btns{
    display: flex;
    justify-content: flex-end;
  }

  .login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }
</style>
